CHS 70x3.5 Hiasa · Weight & Dimensions

Hiasa, cold-formed sections · Circular Hollow Section

Circular Hollow Sections (CHS) are round tubular profiles with the most efficient cross-section for compression. Used for columns, trusses, and architectural structures.

Also known as: Caño estructural redondo (Argentina)

The CHS 70x3.5 steel profile weighs 5.7 kg/m (3.86 lb/ft). Cross-sectional area: 731.206 mm². Moment of inertia Ix = 40.532 cm⁴, Iy = 40.532 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.5 mm ≈ 10 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Thickness (t)	3.5 mm	0.14 in
Diameter (d)	70 mm	2.76 in
Weight	5.7 kg/m	3.86 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	731.21 mm²	1.133 in²
Moment of inertia (Ix)	40.53 cm⁴	0.97 in⁴
Moment of inertia (Iy)	40.53 cm⁴	0.97 in⁴
Elastic section modulus (Sx)	11.58 cm³	0.707 in³
Elastic section modulus (Sy)	11.58 cm³	0.707 in³
Plastic section modulus (Zx)	15.49 cm³	0.945 in³
Plastic section modulus (Zy)	15.49 cm³	0.945 in³
Radius of gyration (rx)	2.35 cm	0.927 in
Radius of gyration (ry)	2.35 cm	0.927 in